Always start with replacing spark plugs for most engine Performance issues. Many times, 3 fresh spark plugs from an auto parts store will resolve the issue for about $11 USD. Once you know your plugs are new and good, then you can do further diagnosis, if necessary.
Perhaps super charger is not working fully,,,2 ways to test,,,1,,,,start it,,,have your hand around the SC hose,,,it should swell when you rev it,,,or,,,
2,, remove the intake hose, see if you can turn the turbine,,,you should NOT be able to do so.